Conveyer



April '30, 1929 L. LLEWELLYN ET AL CONVEYER 2 Sheets-Sheet l Filed 'Aug. 25, 1926 Patented Apr. 30,. 1929.

UNITED [STATES PATENTYOLFFICE.

man LLEWELLYN AND CARL L. 'KENNEY, or @DORMQNT, PENNsYLvANIA, AsSIGNons To PITTSBURGH CGALWASHER COMPANY,- or PITTSBURGH, PENNSYLVANIA, A

CORPORATION OF PENNSYLVANIA.

coNvEYEn.

Application filed August 25, 1926. Serial No. 131,440.

Our invention refers to improvements in convcyers, and is particularly designed for conveying coal or other minerals of varying size. It is particularly designed in connec tion with the transfer of screened eoahover and from a picking table onto a lip screen or chute to a loading boom or the like.

In such mechanism it isdesirable to de liver the coal from the conveyer to the lip screen without loss of the smaller lumps, and with leakage of dust and line particles only.

Ordinarily, with the usual. sectional slat conveyor, the sections or pans are flat, forming a continuous straight moving floor, but with de-forma-tion over the delivery sprocket, resulting in a continuous series of annularly moving flat faces. These, of course, conform generally to the planes of the edges of the sprocket chain links, rendering it impossible to locate the receivingedge of a lip screen closer than the outer meeting edges oi the slats.

The result is that there is a considerable space between the middle of the slat and the clearing edge of the lip screen each time a slat passes around the sprocket, with result ing undesirable leakage.

In our invention we overcomethis difiiculty by archingthe individual slats or sections of the conveyer to a radius corresponding to that of the pitch center of the conveyer pans around the sprocket. so that in deliver ing thereo ver the several sections will approximately form a continuous circumferential delivery surface of uniform radius.

By such ar'angement the receiving edge of the lip screen may be located closelyadjacent the conveyer surfaces, with slight clearance only, and with no variation or alternating openings for leakage.

In the (tlrawingsillustrating one preferred embodiment of the ll1VG11tl0l1,--

Fig. 1 is a longitudinal vertical section showing the picking table conveyor, lip screen, and the conveyor of a loading boom or the like in operative relation;

Fig. 2 is an enlarged similar section of the delivery end of the picking table;

Fig. 3 is a plan view of Fig. 2.

Referring to the drawings, 2 represents the delivery end of the traveling conveyer section comprising the picking table, over which the coal or other supported mineral is moved forpicking'and final delivery onto the inclined screen. section 3. i

The picking table is of any suitable length and is provided with the tail shaft 4 having the usual sprocket wheelsfor engaging and transmitting movement to sprocket chains .5

having the usual supportingh'ack wheels 6, 01: well known construction.

i i i i i i ciecn 5 is of any suitable l(lI1(l, flS,fl bar screen, prov ded with longitudinally ar ranged lnchned bars 7 spaced apart for the desired distance for screening dust, etc. ,1and

mounted on cross bars 8 in the supporting traine-work otthe structureu Screened material passes by gravity into hopper 9 leading to the trough 10 having the screw conveyor 11 for removal to any suitable point. .The shaft of the screw, conveyor is driven; through bevel or other gearing 12 byvbelt or chain 13 from driving shaft 14;,whichis geared with the shaft l as indicatedin Fig. 1. r The conveyor 15 of the loading boom or of any other conveyerconstruct-ion receives the larger screened coal from chute 3 for transportation to any point of delivery.

Screen is of the class known asqa lip screen, provided with a short section of plate 16 ter ninatingm an innerreceiving lip 17 the end of which is desirably locatedfas closely as possible to the peripheral supportpicking table conveyer.

ing surface of the pans orsections 18 or the Sections 18, as shown, are curved to auniform radius, defined from the center of shaft 4 and corresponding to the pitch line of the surface of such sections, so that, when they lie in a continuous horizontal position, they comprise a continuous series of arched sup-.

lip extension, and received thereby without loss or crushing of any of the useful smaller lumps.

hand, when they pass around Flights 18, as shown, are mounted on the inner faces of inner links 5 by means of angle brackets 19 riveted or bolted to the links as at 20, and to the end portions of the curved flights, preferably by countersunk rivets as at 21. Each flight is provided with an upwardly extending edge portion 22, longitudinally extended at each end so as to overlap and underlap the adjacent side of the several sections continuously, as indicated at 23.

The side portions of the flights as thus made, alternate in the same manner as the links 5, providing for expansion of the side retaining portions in rounding the sprocket wheels and preventing lateral escape of the material.

The cross end portions of each flight also overlap and underlap each other, by means of the rounded trough shaped embracing terminalQ l at one end and the inter fitting semicylindrical bar 25 of the next adjacent flight,

secured thereto by welding or in any other suitable way.

By such construction, utilizing alternating interfitting male and female terminals, there is a close rounded joint provided for each pivotally connected flight, at points corresponding to the pivotal connection of links 5, providing for easy movement around the sprockets.

The flights as thus constructed and mount ed, are operated continuously at the proper speed, carrying all of the mineral along through the picking table section for removal of slate or other impurities, and delivering to the screen section 3 for separation of the dust etc.

The several parts are operated by any suitable drive or prime mover from shaft 14 as described, head shaft 26 of conveyer 15 being driven through sprocketor belt gearing from tail shaft 4, as shownin Fig. 1.

The construction is comparatively simple and effects a very considerable saving in merchantable coal because of the close connection between the conveyer bottoms and the end of the lip screen. Section 17 of the screen is preferably beveled at its inner end, and may be renewed from time to time if worn or broken.

The construction may be of any suitable size, or variously changed in different parts, or adapted to other combinations by the builder, but all such changes are to be understood as within the scope of the following claims.

What we claim is:

1. A conveyer flight having an outwardly curved body portion and having a reverscly rounded concaved portion at one end for journal connection with an adjacent flight terminal, and at the other end a part-cylindrical bar conforming to the concaved portion of an adjacent flight.

2. A conveyor flight made of sheet or plate metal rounded to approximate the pitch curvature of a driving sprocket and having alternately concaved and convexed oppositely located edge portions for intcrfitting connection with similar adjacent flights, the convexed portion consisting of a part-cylindrical bar.

3. A conveyer flight made of sheet or plate metal rounded to approximate the pitch curvature of a driving sprocket and having at one end a concavcd edge for inter-fitting engagement with an adjacent flight and at the other edge a part cylindrical bearingrod for engagement with a similarly concaved edge of an adjacent flight. I

4. A conveyer flight made of sheet or plate metal rounded to approximate the pitch curvature of a driving sprocket and having alternately concaved and convexed oppositely located edge portions for interlitting connection with similar adjacent flights, the convexed portion consisting of a part-cylindrical bar secured to the under edge of the flight, and outwardly extending side port-ions.

5. A conveyer flight made of sheet or plate metal rounded to approximate the pitch curvature of a driving sprocket and having alteu nately concaved and convexed oppositely located edge portions for interfitting connection with similar adjacent flights, the convexed portion consisting of a part-cylindrical bar secured to the under edge of the flight, and outwardly extending elongated side portions for alternating outer and inner overlapping engagement with similar adjacent side portions.

6. A conveyor flight having an (mtwardlv curved body portion and a rcversely rounded part cylindrical seating portion atone end for journal connection with the terminal of an adjacent outwardly curved flight, the outwardly curved body portion maintaining its curvature to the opposite edge terminal and having at its under side a partly cylindrical portion for iulerlitting engagement with the seating portion of a similar adjacent dig -(ht.

in testimony whereof we hereunto aflix our signatures.

Llillfl LLEl'VELLYN. C. L. KENNEY. 

